Well I never have tried to profile here's my first try.
I compiled with
ghc --make -O -prof -auto-all chk_dwlds.hs
I've run the program with:
./chk_dwlds \+RTS -p \-RTS
and got this .prof file
Tue Oct 21 15:01 2008 Time and Allocation Profiling Report (Final)
chk_dwlds +RTS -p -RTS
total time = 19.62 secs (981 ticks @ 20 ms)
total alloc = 19,090,366,024 bytes (excludes profiling overheads)
COST CENTRE MODULE %time %alloc
run_file Main 67.2 96.5
check_line Main 31.5 2.5
sumcount Main 1.3 1.0
individual inherited
COST CENTRE MODULE no. entries %time %alloc %time %alloc
MAIN MAIN 1 0 0.0 0.0 100.0 100.0
main Main 238 1 0.0 0.0 100.0 100.0
sumcount Main 242 1 0.0 0.0 0.0 0.0
run_file Main 241 1764 67.2 96.5 100.0 100.0
check_line Main 244 1944781 31.5 2.5 31.5 2.5
sumcount Main 243 1764 1.3 1.0 1.3 1.0
main Main 247 0 0.0 0.0 0.0 0.0
filter_reg Main 248 0 0.0 0.0 0.0 0.0
CAF Main 232 10 0.0 0.0 0.0 0.0
check_line Main 246 2 0.0 0.0 0.0 0.0
regexp Main 245 1 0.0 0.0 0.0 0.0
main Main 239 0 0.0 0.0 0.0 0.0
filter_reg Main 240 2 0.0 0.0 0.0 0.0
CAF Text.Read.Lex 209 8 0.0 0.0 0.0 0.0
CAF GHC.Read 204 1 0.0 0.0 0.0 0.0
CAF GHC.Float 203 3 0.0 0.0 0.0 0.0
CAF GHC.Int 198 1 0.0 0.0 0.0 0.0
CAF GHC.Handle 184 7 0.0 0.0 0.0 0.0
CAF System.Posix.Internals 168 7 0.0 0.0 0.0 0.0
CAF System.Directory 125 1 0.0 0.0 0.0 0.0
Regards
Friedrich